Journal of Veterinary Medical Science
Online ISSN : 1347-7439
Print ISSN : 0916-7250
ISSN-L : 0916-7250
Study of Lipid in the Ear Canal in Canine Otitis Externa with Malassezia pachydermatis
Akira MASUDATakeshi SUKEGAWANaoe MIZUMOTOHiroyuki TANITadashi MIYAMOTOKazumi SASAIEiichiroh BABA
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2000 Volume 62 Issue 11 Pages 1177-1182

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Abstract

An epidemiological investigation of 120 canine otitis externa cases in 1, 370 dogs was done on the incidence rate, ear pinna shapes, breeds and their relationships.Eighty−five cases(12.6%)in 672 dogs with pendulous ears and 35 cases(5.0%)in 698 dogs with erect ears had otitis externa, and the difference between them was significant(P<0.05).Ninety−five auditory cerumen specimens were cultured for Malassezia pachydermatis(M.pachydermatis)and analyzed for concentrations of major fatty acids.Although rates of cases positive for M.pachydermatis in both ear pinna shapes were almost the same, i.e.55.2% in the pendulous group and 53.6% in the erect group, the average total fatty acid level of the pendulous ear group was significantly(P<0.05)higher than that in the erect ear group after dismissing extraordinary levels in the Siberian husky.Isolated M.pachydermatis strains were examined for the effects of fatty acid supplementation on their growth.The majority of the strains utilized fatty acids and grew faster in fatty acid supplemented broth.These results suggest that M.pachydermatis, the predominant causative agent of canine otitis externa, prefers the auditory canal of dogs with lipid−rich earwax and grows fast, but growth strongly depends upon the canine breed.

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この記事はクリエイティブ・コモンズ [表示 - 非営利 - 改変禁止 4.0 国際]ライセンスの下に提供されています。
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja
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